55655551 has 16 divisors (see below), whose sum is σ = 65138688. Its totient is φ = 46569600.

The previous prime is 55655549. The next prime is 55655557. The reversal of 55655551 is 15555655.

It is not a de Polignac number, because 55655551 - 2¹ = 55655549 is a prime.

It is a super-2 number, since 2×55655551² = 6195080714227202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55655551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55655557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55666 + ... + 56656.

It is an arithmetic number, because the mean of its divisors is an integer number (4071168).

Almost surely, 2^55655551 is an apocalyptic number.

55655551 is a deficient number, since it is larger than the sum of its proper divisors (9483137).

55655551 is a wasteful number, since it uses less digits than its factorization.

55655551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

The product of its digits is 93750, while the sum is 37.

The square root of 55655551 is about 7460.2648076325. The cubic root of 55655551 is about 381.8002093873.

The spelling of 55655551 in words is "fifty-five million, six hundred fifty-five thousand, five hundred fifty-one".